"I'm with you!" exclaimed Harry. "What shall we do?"
"Let's sit up some night and watch that closet," said Bert. "We can easily do it."
"Will your folks let us?"
"We won't ask them. Oh, I wouldn't do anything I knew they didn't want me to do without asking," Bert said quickly, as he saw his cousin's startled glance.
"But there's no harm in this," Bert went on. "We'll go to bed early some night, and, when all the rest of them are asleep, we'll get up and stand watch all night. You can watch part of the time, and when you get sleepy I'll take my turn. Then we can see whether anything is hiding in that closet."
"Do you think there is?" asked Harry.
"I'm sure I don't know what to think," Bert answered. "Only it's a mystery, and we ought to find out what it is."
"I'm with you," said Harry again.
"Are you talking secrets?" asked Nan, suddenly coming up just then.
"Sort of," admitted her brother, laughing.
"Oh, tell me—do!" she begged.
